A Caltech Library Service

The Mechanism of Cosmic-Ray Counter Action

Anderson, Carl D. and Millikan, R. A. and Neddermeyer, Seth and Pickering, William (1934) The Mechanism of Cosmic-Ray Counter Action. Physical Review, 45 (6). pp. 352-363. ISSN 0031-899X. doi:10.1103/PhysRev.45.352.

See Usage Policy.


Use this Persistent URL to link to this item:


A study of photographs taken in a very powerful magnetic field with the aid of a cloud chamber activated by counter responses shows (1) that such an arrangement has a strong selective action on showers; (2) that showers so selected have an exceptional multiplicity of tracks; (3) that the two counters show simultaneous responses when no single particle can pass through both of them; (4) that in general these showers consist of a mixture of positive and negative electrons rather than of electrons and protons, no effects certainly attributable to neutrons being observed; (5) that these electrons in getting out of the nucleus some times produce an intense photon spray of the nature of "brems strahlung"; (6) that these photon sprays are increasingly responsible for the simultaneous activation of the two counters the thicker the intervening lead; (7) that a light element like carbon has little effect in producing either showers or sprays; (8) that the total energy of a shower is not larger than that of single electrons (+ or -); (9) that the Dirac theory encounters certain difficulties in accounting for the observed effects.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:©1934 The American Physical Society Received 26 December 1933
Issue or Number:6
Record Number:CaltechAUTHORS:ANDpr34a
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6774
Deposited By: Archive Administrator
Deposited On:21 Dec 2006
Last Modified:08 Nov 2021 20:36

Repository Staff Only: item control page